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Key Facts: SOLAS Pipefitting Exam

100

Practice Questions

OpenExamPrep

Level 6

NFQ Craft Award

QQI

4 years

Apprenticeship Length

SOLAS

Phases 2/4/6

Off-the-job Exams

SOLAS

Engineering

Craft Family (not plumbing)

SOLAS

State-funded

No Exam Fee

SOLAS

The SOLAS Pipefitting apprenticeship is a four-year NFQ Level 6 engineering craft programme delivered by SOLAS, Ireland's Further Education and Training Authority, with Education and Training Boards and technological universities, leading to a QQI Advanced Certificate in Craft - Pipefitting. It alternates on-the-job training with an approved employer and off-the-job phases (notably Phases 2, 4 and 6), each assessed by modular written/theory, practical and drawing assessments rather than one fixed-length exam. The trade covers pipework systems and materials, fabrication and jointing, valves and fittings, isometric and technical drawing, welding and brazing of pipe, pressure systems, supports and health and safety, in an industrial engineering context distinct from domestic plumbing. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample SOLAS Pipefitting Practice Questions

Try these sample questions to review concepts for the SOLAS Pipefitting exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1On a piping isometric, a line is labelled "4" SCH 40". What does the "SCH 40" designation specify?
A.The nominal bore diameter in millimetres
B.The wall thickness/strength class of the pipe
C.The maximum operating pressure in bar
D.The grade of carbon steel material
Explanation: Schedule (SCH) is the standardised pipe wall-thickness class. For a given nominal pipe size the outside diameter stays fixed, while a higher schedule (e.g. SCH 80) has a thicker wall and thinner bore than SCH 40. It is the primary way a pipefitter selects pipe for a given pressure rating.
2A simple 45-degree offset has a measured offset (set) of 300 mm. What is the travel (centre-to-centre length of the offset piece)?
A.212 mm
B.300 mm
C.424 mm
D.600 mm
Explanation: For a 45-degree offset the travel equals the offset multiplied by the constant 1.414 (1 / sin 45 deg). So 300 mm x 1.414 = 424 mm. This is one of the most frequently used pipefitting calculations on the SOLAS off-the-job phases.
3Which jointing method is most appropriate for permanently connecting two lengths of large-bore (DN150) carbon steel process pipe?
A.BSP threaded coupling
B.Compression fitting
C.Butt-weld joint
D.Push-fit connector
Explanation: Butt welding produces a full-penetration, permanent joint suited to large-bore, higher-pressure carbon steel pipework. The pipe ends are bevelled, aligned with a root gap and welded, giving a joint as strong as the parent metal. Threaded and compression joints are limited to small bores and lower duties.
4A gate valve is best described as a valve that is intended primarily for:
A.Throttling and regulating flow rate
B.Fully open or fully closed (isolation) duty
C.Preventing reverse flow automatically
D.Relieving excess system pressure
Explanation: A gate valve uses a sliding wedge/gate that gives an unobstructed full-bore opening when raised, so it offers low resistance and is designed for on/off isolation. It should not be used for throttling, because partial opening causes seat erosion and vibration.
5In brazing, what physical mechanism draws the molten filler metal into the gap between the pipe and the fitting?
A.Capillary action
B.Gravity feed only
C.Magnetic attraction
D.Electrolytic action
Explanation: Brazing relies on capillary action: the molten filler metal is drawn into the close-fitting joint clearance between the mating surfaces. A correctly sized clearance (typically around 0.04-0.2 mm) is essential, because too wide or too narrow a gap reduces capillary flow and weakens the joint.
6When TIG welding a stainless steel pipe root with full penetration, why is the inside of the pipe back-purged with argon?
A.To preheat the joint and reduce cracking
B.To prevent oxidation (sugaring) of the weld root
C.To speed up cooling of the weld
D.To add carbon to the weld metal
Explanation: Back-purging displaces oxygen on the inside (root) of the joint. Without it, the hot stainless root oxidises, producing a granular, weak, corroded surface known as sugaring. An inert argon purge keeps the root bright and sound until it has cooled below the oxidation temperature.
7A pressure relief (safety) valve on a steam system is set to:
A.Open gradually as pressure approaches the working pressure
B.Open and discharge once a defined set pressure is exceeded
C.Throttle flow continuously to hold a fixed pressure
D.Prevent backflow when the system is shut down
Explanation: A safety/relief valve stays shut during normal operation and lifts to discharge once system pressure exceeds its predetermined set pressure, protecting the vessel or line from overpressure. It reseats once pressure falls back below the set point (allowing for blowdown).
8What is the principal reason for fitting a pipe support/hanger at correct intervals along a horizontal run of steel pipe?
A.To electrically earth the pipework
B.To prevent sag, undue stress and joint failure
C.To increase the flow rate in the pipe
D.To colour-code the service carried
Explanation: Supports carry the dead weight of pipe, contents and insulation and limit deflection (sag) between supports. Correct spacing prevents excessive bending stress, pooling of liquid, and strain on joints and fittings. Spacing increases with pipe size and stiffness.
9Before any cutting, grinding or hot work is carried out on an existing process line, the FIRST safety action a pipefitter should confirm is that the line is:
A.Painted the correct colour
B.Isolated, drained, depressurised and made safe (permit to work)
C.Fitted with the largest available valve
D.Insulated to the full thickness
Explanation: Safe systems of work require the line to be positively isolated, drained, depressurised, purged where necessary and covered by a permit to work before breaking into it. This prevents release of stored pressure, hazardous contents or ignition during hot work.
10On a piping isometric drawing, a circle drawn with bolt holes at a pipe end most commonly represents a:
A.Reducer
B.Flange
C.Union
D.Cap
Explanation: Flanges are shown on isometrics as a short line or circle with the bolt circle indicated; in the isometric symbol set a flanged connection is drawn as two parallel lines (or a circle with bolts in plan). Reading these symbols correctly lets the fitter set out and fabricate the spool.

About the SOLAS Pipefitting Exam

The SOLAS Pipefitting apprenticeship is a four-year NFQ Level 6 engineering craft programme in Ireland leading to a QQI Advanced Certificate in Craft - Pipefitting. It combines on-the-job training with an approved employer and off-the-job phases in training centres and technological universities, with modular assessments across pipe systems and materials, fabrication and jointing, valves and fittings, isometric drawing, welding and brazing of pipe, pressure systems, supports and safety.

Exam sponsor: SOLAS (Further Education and Training Authority) with Education and Training Boards and Technological Universities. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

NFQ Level 6 craft apprenticeship assessed through modular written/theory, practical and drawing assessments across off-the-job training phases; this practice bank is 100 selected-response items

Time Limit

Varies by phase module assessment

Passing Score

Typically 50% per module (phase assessments graded Pass/Merit/Distinction)

Exam / Certification Fees

No separate exam fee for registered apprentices; the apprenticeship is state-funded

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

16%

Pipework Systems & Materials

Pipe sizing, schedules and DN designations, carbon steel/stainless/copper/cast iron/plastic materials and grades, corrosion and galvanic protection, and service media

16%

Pipe Fabrication & Jointing

Marking out and square cutting, bevelling and weld preparation, butt/socket/threaded joints, flange assembly and bolting, mitred bends, take-outs and cut lengths, and fit-up

14%

Valves & Fittings

Gate, globe, ball, butterfly and check valves, relief and pressure-reducing valves, elbows/tees/reducers, flanges, gaskets, strainers and branch fittings, and pressure-class ratings

14%

Isometric & Technical Drawings

Reading isometrics, fitting/valve/flange/weld symbols, centreline and elevation dimensioning, line tags and class, bill of materials, and offset/rolling-offset calculations

20%

Welding & Brazing of Pipe

MMA/TIG/MIG pipe welding, root passes and back-purging, brazing and soldering of copper, flux/filler selection, preheat and PWHT, weld defects, NDT and welder qualification

10%

Pressure Systems

Pressure/force/area and flow calculations and units, hydrostatic and pneumatic testing, steam traps, water hammer, thermal expansion, venting and draining

6%

Pipe Supports

Support spacing and spans, rigid and spring hangers, anchors and guides, riser clamps, U-bolts, pipe shoes for insulated lines, and lagging

4%

Health & Safety

Isolation and permit-to-work, hot work and confined-space entry, PPE, oxy-fuel/flashback safety, safe lifting and slinging, and safety data sheets

Preparing for the SOLAS Pipefitting Exam

What You Need to Know

  • Passing score: Typically 50% per module (phase assessments graded Pass/Merit/Distinction)
  • Assessment: NFQ Level 6 craft apprenticeship assessed through modular written/theory, practical and drawing assessments across off-the-job training phases; this practice bank is 100 selected-response items
  • Time limit: Varies by phase module assessment
  • Exam / certification fees: No separate exam fee for registered apprentices; the apprenticeship is state-funded Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

SOLAS Pipefitting: Suggested Study Strategy

1Master the core pipefitting maths early: the 45-degree offset constant (travel = offset x 1.414), take-outs, cut lengths and rolling offsets come up repeatedly
2Learn to read isometrics fluently - symbols for valves, fittings, flanges and welds, centreline and BOP/TOS dimensioning, line tags and the bill of materials
3Know your valves cold: gate (isolation), globe (throttling), ball/butterfly (quarter-turn), check (non-return), relief and pressure-reducing - and when each is used
4Weld and braze theory carries the most marks - revise MMA/TIG/MIG, root passes and back-purging of stainless, brazing flux and filler, preheat/PWHT, defects and NDT
5Be precise on pressure units and testing - convert bar/kPa/MPa, apply F = P x A and Q = A x v, and know why hydrostatic testing is safer than pneumatic
6Complete all 100 practice questions and review every miss with the AI tutor before each phase assessment

Frequently Asked Questions

How is the SOLAS Pipefitting apprenticeship assessed?

It is an NFQ Level 6 craft apprenticeship assessed through modular phase examinations across the off-the-job phases (notably Phases 2, 4 and 6), combining written/theory, practical and drawing assessments rather than one single fixed-length exam. Phase modules are typically graded Pass, Merit or Distinction.

How long is the pipefitting apprenticeship in Ireland and what qualification do I get?

The pipefitting apprenticeship is a four-year programme alternating on-the-job training with an approved employer and off-the-job phases in training centres and technological universities. On completion you receive a QQI Advanced Certificate in Craft - Pipefitting at NFQ Level 6.

What topics does the SOLAS pipefitting exam cover?

It covers pipework systems and materials, pipe fabrication and jointing, valves and fittings, isometric and technical drawing, welding and brazing of pipe, pressure systems, pipe supports, and health and safety. The trade is set in an industrial engineering context, distinct from domestic plumbing.

Is pipefitting the same as plumbing in Ireland?

No. Pipefitting is a separate NFQ Level 6 engineering craft focused on industrial and process pipework, large-bore steel and stainless systems, welded and flanged joints, isometric fabrication and pressure systems. Plumbing is its own SOLAS apprenticeship covering domestic water, heating, gas and sanitation.

Do I have to pay to sit the pipefitting phase exams?

Registered apprentices do not pay a separate exam fee; the apprenticeship is state-funded and apprentices are paid by their employer during the programme. You must be registered with a SOLAS-approved employer to take part.

Is this free SOLAS pipefitting practice as good as paid prep?

Our 100 practice questions cover the full pipefitting syllabus - materials, fabrication, valves, drawings, welding and brazing, pressure systems, supports and safety - with a teaching explanation for every answer plus a free daily AI tutor. All content is free forever and updated for 2026.